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Earnings Per Share Of Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net loss	$ 174	$ (1,089)	$ 379	$ (761)
Weighted average number of basic shares outstanding	444	425	443	424
Assumed exercise of dilutive stock options and awards (in shares)	1	0	1	0
Weighted average number of diluted shares outstanding	445	425	444	424
Basic earnings (losses) per share of common stock (in dollars per share)	$ 0.39	$ (2.56)	$ 0.86	$ (1.79)
Diluted earnings (losses) per share of common stock (in dollars per share)	$ 0.39	$ (2.56)	$ 0.85	$ (1.79)
Shares excluded from the calculation of diluted shares outstanding, in shares	1	3	1	3

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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